Read head preamplifier with thermal asperity transient control

Details Read head preamplifier with thermal asperity transient control Read head preamplifier with thermal asperity transient control

2007-09-25

2007-09-25

Korzuch, William (Department: 2627)

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

C360S046000

Reexamination Certificate

active

10815135

ABSTRACT:
A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.

REFERENCES:
patent: 5497111 (1996-03-01), Cunningham
patent: 5818656 (1998-10-01), Klaassen et al.
patent: 6051997 (2000-04-01), Yeung et al.
patent: 6104331 (2000-08-01), Ishida et al.
patent: 6252459 (2001-06-01), Franck
patent: 6255898 (2001-07-01), Ono et al.
patent: 6359743 (2002-03-01), Patti et al.
patent: 6381082 (2002-04-01), Voorman et al.
patent: RE37751 (2002-06-01), Sutardja
patent: 6446236 (2002-09-01), McEwen et al.
patent: 6735260 (2004-05-01), Eliezer et al.
patent: 2002/0008928 (2002-01-01), Takahashi
patent: 2002/0085298 (2002-07-01), Sobey
patent: 2002/0122265 (2002-09-01), Chambers et al.
patent: 2003/0007268 (2003-01-01), Smith
Klaasen, K.B., van Peppen, J.C.L., “Electronic Abatement of Thermal Interference in (G)MR Head Output Signals”, IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 2611-2616.

Affiliated with

Also associated with

Rating

Read head preamplifier with thermal asperity transient control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Read head preamplifier with thermal asperity transient control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Read head preamplifier with thermal asperity transient control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3733013